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(N0 Mo de l.) E. M. HAMILTON.

TELEGRAPH INSTRUMBNT.

'No. 379,060. 7 Patented Mar. 6, 1888.

. UNITED STATES PATENT ()EErcE.

EMERY M. HAMILTON, OF NEW YORK, N. Y.

TELEGRAPH-INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 379,060, dated March 6,1888.

Application filed April 28, 1886.

vwhich there is an armaturelever which is adapted to vibrate between stops, and which has a retracting spring; and my invention consists in the devices and their combinations, hereinafter specified, and as more at length recited in the claims.

Figure 1 is a planof a relay containing my invention. Fig. 2 is a side elevation of the same. Fig. 3 is avertical central longitudinal section of the same on the line x 00, Fig. 1. Fig. 4 is a vertical central section of a modified form, in detail, of one part of my invention. Fig. 5 is a horizontal cross-section on the line yy, Fig. 3; and Fig. 6 is a plan of the magnet.

A is the base of the instrument.

B is the magnet.

G is the armature, and G is the armaturelever fulcrumed at c, and thus having the long arm 0 vibrating between stops, as shown, and

' the short arm 0.

O is the retracting-spring of the armaturelever.

D is a rod or finger-piece, to which the end of the retracting-spring opposite to the end thereof attached to the armature-lever is connected, preferably by an arm, D, which is fixed on said rod and extends therefrom at an angle thereto and reaching to the axis of said spring. The rod D is seated in or supported by a post, E, and is capable of free longitudinal movement therein or thereon in the direction against the tension of the retracting-spring, and is provided with means, substantially as hereinafter set forth, whereby its movement in the opposite direction is adjustably limited.

The post E is preferably hollow, as shown, and the rod D fitted to slide therein as a plunger, with its arm D extending through a longitudinal slot, 6, in the post, and with a nut, E, turning on the exteriorly-threaded post,

Serial No. 200,443. (No model.)

as shown, and located relatingly to the arm D on the side thereof toward the direction of the tension of the retracting-spring, as shown in Figs. 2 and 3. By means of these devices the rod or finger-piece D has free longitudinal movement in the post in the direction against the tension of the retracting-spring, and its movement in the opposite direction may be adjustably limited by turning the nut E up or down on the post.

If desired, the rod D may extend entirely through the post, which latter may be screwscated in the base, as at a, Fig. 4., and the arm D may reach from the rod beyond the lower end of the post, with a stern, d, reaching up through a suitable slot, a, in the base to the connection with the spring, as shown in Fig. 4. The base in this case should be suitably recessed to permit the screw-post to be screwed up or down and to allow for the play of the rod and its arm. The rod D is desirably provided with a button, d, on its upper or exposed end, for conveniently applying the pressure of 7 5 the operators finger.

My described devices are useful in telegraphinstruments where there are variations in the electric current of the circuit which require that the tension of the retraoting'spring of the armature-lever should be quickly and conveniently adjusted to such variation s-as, for example, in relays. It is obvious that by pressure upon the rod or finger-piece D by the operator, so as to disengage the same from its motionlimiting device, the tension of the spring 0 may be felt Wholly through or on the rod, and variations in the current be thus readily detected, and the rod having free movement in the direction against the tension of the spring, it is obvious that the operator may by such pressure on the rod ascertain the proper spring-tension relatively to the current, and by turning the nut E up or down adjust said spring'tension fixedly to the current.

It is evident that itv is possible, in the employment of these described devices, to arrange the magnet with its axis perpendicular to the base, of the instrument, as shown, and consequently with the armature-lever in a substantially horizontal position, and to seat the rod D and its bearing-post E perpendicular to the base, with the arm D reaching from the rod to the retracting-spring. By this means compactness and economy in the structure of the instrument are secured, and the rod D is so located that while it is pressed upon by the first finger of the operators left or disengaged hand the nut E may at the same time be turned up or down by the thumb and second finger of the same hand of the operator, whereby the testing and adjustment of the tension of the retracting-spring may be accom plished quickly and conveniently by one hand of the operator without interfering with his work by the right or other hand, as at the telegraph-key.

F is a bar connecting the poles or coresf of a magnet arranged perpendicular to the base of the instrument. Said bar is located in a recess, a", in the base, and the cores project upward through suitable slots, e in the baseplate. A rod, f, seated at one end in the bar 1*, extends upward through a slot, a in the base-plate, and passing, preferably,between the cores f and through a hollow pillar, f, there located, as shown, reaches upward through a slot, 0, in the armature-lever, where its projected end f is threaded,and has a thumb-nut, f, which bears upon the top of the pillar. A spring, f, on the rod has bearing between the bar F and the under side of the base-plate. It is obvious that by means of these devices the turning of the nut f will operate to raise or lower the magnet on the bar F, and so render the magnet adjustable to the armature perpendicularly to and through the base of the instrument.

G is a pillar fixed in the base and perpendicular thereto and in line with the contact arm 0 of the horizontal armaturelever, the magnet being perpendicular to the base, as described. At the top of the pillar and extended toward and reaching under the end of the arm 0 of the armature-lever is the arm or bracket 9, in which, extending from below upward, is the adjustable set-screw g, carrying on its upper extended end a contact point or stop,g, immediately in line below the point e" on the under side of the lever C. An adj ustable set-screw, g, is seated in the top of the pillar, and projects upwardly therefrom, and has the flanged head 9*, the rim of which extends over the contact-point c on the upper side of the armature-lever. By means of this pillar and its described devices, located, as specified, relatively to the perpendicular magnet and horizontal armature-lever, the compactness, economy, and simplicity of the structure of the instrument, as well as complete effectiveness, are secured.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a telegraph-instrument in which an armature-lever is vibratory between stops and has a retracting-spring, the eornbinatiornwith said lever and spring, of a rod connected to said spring, a support in which said rod is seated and in which it has free movement in the direction against the tension of said spring, an arm carried by said rod, and a screw-seated motion-limiting stop in engagement with said arm, whereby the movement of the said rod in the direction of the tension of said spring is adj ustably limited, as and for the purpose set forth.

2. In a telegraph-instrument in which an armature-lever is vibratory between stops and has a retracting-spring, the combination,with said lever and spring, of a rod, a hollow and slotted post, in which said rod is fitted to slide, and in which said rod has free movement in the direction against the tension of said spring, an arm carried by said rod and working in said slotted post and connected at its free end to the retracting spring, and a nut working on a thread on the exterior of said post and engaging said arm to adj ustably limit the movement of said rod in the direction of the tension of said spring, as and for the purpose specified.

3. In a telegraph-instrument in which an armaturelever is vibratory between stops and has a retracting-spring, the combination, with said lever and spring, of a rod, a hollow externally-threaded post adj ustabl y screw-seated in the recessed base of the instrument, and in which the rod is fitted to slide and have free movement in the direction against the tension of said spring, and beyond the seated end of 5 by the movement of the rod in the direction of [00 the tension of said spring is adjustablylimited, as and for the purpose set forth.

4. In a telegraph-instrument in which the armature-lever is located parallel to the baseplate, as described, the magnet-eores mounted on a bar in a recess in the base of the instrument and extending upwardly perpendicular to the base, toward the armature, through a slot in the base-plate, together with a rod fixed to said bar and extending upwardly, a hollow post with a threaded upper end provided with a nut thereon bearing on said post, and a spring having bearing between said core-bar and the baseplate, as described, and for the purpose set forth.

EMERY M. HAMILION.

Witnesses:

A. G. N. VERMILYA, A. S. FITCH. 

